1 - Select your version of Thunderbird or Sunbird

2 - Download and install BirdieSync desktop version for Windows

Once downloaded, execute BirdieSyncSetup.exe and follow the setup instructions.

If you wish to connect your Android device over USB, you may have to download and install Android USB drivers.

3 - Install BirdieSync on your Android device

To install BirdieSync from the web, go to the Android Market and click on the "Install" button.

To install BirdieSync from your Android device, open "Android Market" application, and search for "BirdieSync" application. Then download, install and launch it.

Note that the version of the desktop application and the Android version don't necessarily match. But the latest version (presently 2.3.10.3) for Android is compatible with the latest version of the desktop.